diff --git a/src/undo.c b/src/undo.c
index 7f1aa8a..cb51c99 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -1918,6 +1918,8 @@
 		last->uh_alt_next = uhp;
 		uhp->uh_alt_prev = last;
 
+		if (curbuf->b_u_oldhead == uhp)
+		    curbuf->b_u_oldhead = last;
 		uhp = last;
 		if (uhp->uh_next != NULL)
 		    uhp->uh_next->uh_prev = uhp;